Wednesday 3 July 2013 05.40 EDT
First published on Wednesday 3 July 2013 05.40 EDT

Bayern Munich's new £31.5m signing Mario Götze has made an uneasy start to life at his new Adidas-backed club after he turned up for his official unveiling in a Nike T-shirt.

Götze, Pep Guardiola's first signing at the club, posed for the media while holding his new Adidas-made Bayern top. Adidas hold a 9% stake in the club, and their chief executive Herbert Hainer is a member of Bayern's board.

Oliver Brüggen, a spokesman for Adidas, told Bild: "The pictures taken at the Mario Götze press conference have surprised us, negatively. Contractually it is not allowed: this was an official function of Adidas partners Bayern."

Bayern's spokesman Mark Hörwick told the paper: "We have apologised to Adidas on the phone. We have promised them that such a thing will never happen again."